How can I get rid of the little boxes that appear with the controls unwanted?

Using OS X on my 21.5-inch iMac 10.11.6 find small boxes containing unwanted orders often open on my computer screen when I place my cursor in a position to order an action such as 'delete' (for example) which is already there and requires nothing more than a pressure on my mouse to work. These boxes often vary in content, and all are difficult and time consuming to remove. Is there a way to prevent their unwanted interference? They began to appear after that I upgraded my operating system of Mountain Lion 2 months ago; no such troubling interference never occurred before this conversion.

Please post a screenshot of what you're trying to describe.

Tags: Mac OS & System Software

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